/*
 * Copyright (C) 2011 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.webui.form.input;

import java.io.Writer;

import org.exoplatform.commons.serialization.api.annotations.Serialized;
import org.exoplatform.webui.application.WebuiRequestContext;
import org.exoplatform.webui.form.UIForm;
import org.exoplatform.webui.form.UIFormInput;
import org.exoplatform.webui.form.UIFormInputBase;

/**
 *  <p>Represent an html checkbox input <br/> 
 * This class is a replacement for {@link org.exoplatform.webui.form.UIFormCheckBoxInput} <br/>
 * Still support raising event when user click the checkbox, but now we only accept boolean value. </p> 

 * @author <a href="mailto:phuong.vu@exoplatform.com">Vu Viet Phuong</a>
 * @version $Id$
 */
@Serialized
public class UICheckBoxInput extends UIFormInputBase<Boolean>
{
   /**
    * Name of {@link org.exoplatform.webui.event.EventListener} that will be fired when checkbox state is changed 
    */
   private String onchange_;

   /**
    * Id of {@link org.exoplatform.webui.core.UIComponent} that is configured with the fired event 
    * This component must be in the same form with the checkbox
    * If this field is null, event of the UIForm will be fire instead
    */
   private String componentEvent_ = null;

   public UICheckBoxInput()
   {
      this(null, null, false);
   }

   public UICheckBoxInput(String name, String bindingExpression, Boolean value)
   {
      super(name, bindingExpression, Boolean.class);
      setValue(value);
   }

   public UIFormInput<Boolean> setValue(Boolean value)
   {
      if (value == null)
      {
         value = false;
      }
         
      return super.setValue(value);
   }
   
   /**
    * This method is used to make the action more meaning in the context of a checkbox
    */
   public boolean isChecked()
   {
      return getValue();
   }

   /**
    * This method is used to make the action more meaning in the context of a checkbox
    */
   public UICheckBoxInput setChecked(boolean check)
   {
      return (UICheckBoxInput)setValue(check);
   }

   public void setOnChange(String onchange)
   {
      onchange_ = onchange;
   }

   public void setComponentEvent(String com)
   {
      componentEvent_ = com;
   }

   public void setOnChange(String event, String com)
   {
      this.onchange_ = event;
      this.componentEvent_ = com;
   }

   public String renderOnChangeEvent(UIForm uiForm) throws Exception
   {
      if (componentEvent_ == null)
         return uiForm.event(onchange_, null);
      return uiForm.event(onchange_, componentEvent_, (String)null);
   }

   public void decode(Object input, WebuiRequestContext context) throws Exception
   {
      if (!isEnable())
         return;
      
      if (input == null || "false".equals(input.toString()))
      {
         setValue(false);
      }
      else 
      {
         setValue(true);
      }
   }

   public void processRender(WebuiRequestContext context) throws Exception
   {
      Writer w = context.getWriter();
      w.write("<input type='checkbox' name='");
      w.write(name);
      w.write("'");
      if (onchange_ != null)
      {
         UIForm uiForm = getAncestorOfType(UIForm.class);
         w.append(" onclick=\"").append(renderOnChangeEvent(uiForm)).append("\"");
      }
      if (isChecked())
         w.write(" checked");
      if (!isEnable())
         w.write(" disabled");
      w.write(" class='checkbox'/>");
      if (this.isMandatory())
         w.write(" *");
   }

}